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Learn Subnetting the Easy Way with this Free Downloadable Quiz

You can verify your answers with our Subnet Calculator or VLSM Calculator.Download our Subnet Cheat Sheet for all the essential information you need to quickly perform subnet calculations in your head.

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Amazon VPC lets you provision a logically isolated section of the Amazon Web Services (AWS) cloud where you can launch AWS resources in a virtual network that you define. You have complete control over your virtual networking environment, including selection of your own IP address ranges, creation of subnets, and configuration of route tables and network gateways. You can also create a hardware Virtual Private Network (VPN) connection between your corporate datacenter and your VPC and leverage the AWS cloud as an extension of your corporate datacenter.

You can easily customize the network configuration for your Amazon VPC. For example, you can create a public-facing subnet for your web servers that have access to the Internet, and place your backend systems such as databases or application servers in a private-facing subnet with no Internet access. You can leverage multiple layers of security, including security groups and network access control lists, to help control access to Amazon EC2 instances in each subnet.

Yes, you can bring your public IPv4 addresses and IPv6 GUA addresses into AWS VPC and statically allocate them to subnets and EC2 instances. To access these addresses over the Internet, you will have to advertise them to the Internet from your on-premises network. You will also have to route the traffic over these addresses between your VPC and on-premises network using AWS DX or AWS VPN connection. You can route the traffic from your VPC using the Virtual Private Gateway. Similarly, you can route the traffic from your on-premises network back to your VPC using your routers.

For an instance launched in an IPv4 or dual-stack subnet, the primary private IPv4 address is retained for the instance's or interface's lifetime. Secondary private IPv4 addresses can be assigned, unassigned, or moved between interfaces or instances at any time. For an instance launched in an IPv6-only subnet, the assigned IPv6 GUA which is also the first IP address on the instance's primary network interface can be modified by associating a new IPv6 GUA and removing the existing IPv6 GUA at any time.

Yes, however, the EIP addresses will only be reachable from the Internet (not over the VPN connection). Each EIP address must be associated with a unique private IP address on the instance. EIP addresses should only be used on instances in subnets configured to route their traffic directly to the Internet gateway. EIPs cannot be used on instances in subnets configured to use a NAT gateway or a NAT instance to access the Internet. This is applicable only for IPv4. Amazon VPCs do not support EIPs for IPv6 at this time.

Your BYOIP prefix will show as an IP pool in your account. You can create Elastic IPs (EIPs) from the IPv4 pool and use them like regular Elastic IPs (EIPs) with any AWS resource that supports EIPs. Currently, EC2 instances, NAT Gateways, and Network Load Balancers support EIPs. You can associate CIDRs from your IPv6 pool to your VPC. The IPv6 addresses brought over via BYOIP work exactly the same as Amazon-provided IPv6 addresses. For example, you can associate these IPv6 addresses to subnets, Elastic Network Interfaces (ENI) and EC2 instances within your VPC.

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Security groups in a VPC specify which traffic is allowed to or from an Amazon EC2 instance. Network ACLs operate at the subnet level and evaluate traffic entering and exiting a subnet. Network ACLs can be used to set both Allow and Deny rules. Network ACLs do not filter traffic between instances in the same subnet. In addition, network ACLs perform stateless filtering while security groups perform stateful filtering.

Yes. If an Internet gateway has been configured, Amazon VPC traffic bound for Amazon EC2 instances not within a VPC traverses the Internet gateway and then enters the public AWS network to reach the EC2 instance. If an Internet gateway has not been configured, or if the instance is in a subnet configured to route through the virtual private gateway, the traffic traverses the VPN connection, egresses from your datacenter, and then re-enters the public AWS network.

You can create a flow log for a VPC, a subnet, or a network interface. If you create a flow log for a subnet or VPC, each network interface in that subnet or VPC is monitored. While creating a flow log subscription, you can choose the metadata fields you wish to capture, the maximum aggregation interval, and your preferred log destination. You can also choose to capture all traffic or only accepted or rejected traffic. You can use tools like CloudWatch Log Insights or CloudWatch Contributor Insights to analyze your VPC flow logs delivered to CloudWatch Logs. You can use tools like Amazon Athena or AWS QuickSight to query and visualize your VPC flow logs delivered to Amazon S3. You can also build a custom downstream application to analyze your logs or use partner solutions such as Splunk, Datadog, Sumo Logic, Cisco StealthWatch, Checkpoint CloudGuard, New Relic etc.

Yes. DescribeInstances() will return all running Amazon EC2 instances. You can differentiate EC2-Classic instances from EC2-VPC instances by an entry in the subnet field. If there is a subnet ID listed, the instance is within a VPC.

Yes, however, an instance launched in a VPC using an Amazon EBS-backed AMI maintains the same IP address when stopped and restarted. This is in contrast to similar instances launched outside a VPC, which get a new IP address. The IP addresses for any stopped instances in a subnet are considered unavailable.

Yes, the instance hostname can be used as DNS hostnames. For instances launched in an IPv4-only or dual-stack subnet, the IP based name always resolves to the Private IPv4 address on the primary network interface of the instance and this cannot be turned off. Additionally, the Resource based name can be configured to resolve to either the Private IPv4 address on the primary network interface, or the first IPv6 GUA on the primary network interface, or both. For instances launched in an IPv6-only subnet, the Resource based name will be configured to resolve to the first IPv6 GUA on the primary network interface.

A default VPC is a logically isolated virtual network in the AWS cloud that is automatically created for your AWS account the first time you provision Amazon EC2 resources. When you launch an instance without specifying a subnet-ID, your instance will be launched in your default VPC.

No. You can use the AWS Management Console, AWS EC2 CLI, or the Amazon EC2 API to launch and manage EC2 instances and other AWS resources in a default VPC. AWS will automatically create a default VPC for you and will create a default subnet in each Availability Zone in the AWS region. Your default VPC will be connected to an Internet gateway and your instances will automatically receive public IP addresses, just like EC2-Classic.

No. Default VPCs are attached to the Internet and all instances launched in default subnets in the default VPC automatically receive public IP addresses. You can add a VPN connection to your default VPC if you choose.

Yes, you can delete a default subnet. Once deleted, you can create a new default subnet in the availability zone by using the CLI or SDK. This will create a new default subnet in the availability zone specified. This does not restore the previous subnet that was deleted.

Amazon VPC gives you complete control over your virtual network environment on AWS, logically isolated to your AWS account. In the EC2-Classic environment, your workloads are sharing a single flat network with other customers. The Amazon VPC environment offers many other advantages over the EC2-Classic environment including the ability to select your own IP address space, public and private subnet configuration, and management of route tables and network gateways. All services and instances currently available in EC2-Classic have comparable services available in the Amazon VPC environment. Amazon VPC also offers a much wider and latest generation of instances than EC2-Classic. Further information about Amazon VPC is available in this link.

The concept of data transfer costs is similar to that of data transfer costs for EC2 instances. Since an interface-based VPC endpoint is an ENI in the subnet, data transfer charges depend on the source of the traffic. If the traffic to this interface is coming from a resource across AZ, EC2 cross-AZ data transfer charges apply to the consumer end. Customers in the consumer VPC can use AZ-specific DNS endpoint to make sure the traffic stays within the same AZ if they have provisioned each AZ available in their account.

Yes. You can use the AWS Management Console to manage Amazon VPC objects such as VPCs, subnets, route tables, Internet gateways, and IPSec VPN connections. Additionally, you can use a simple wizard to create a VPC.

This application offers a user friendly way to practice subnetting questions.A stylish layout and look offers a unique and more interesting way of learning. Designed for ease of use implementing a fun feel to an often tediously portrayed subject. Various forms of answering questions allows a more relaxed and productive way to learn the art of subnetting.This application offers two types of practice:A general practice option - a cycle of random questions with the user input utilizing a unique number entry system which enables input without the keyboard pop-up annoyances. Instant answer feedback and a summary of your score when you finish the practice.A quiz option - the random questions can be answered from a selection of four possible answers. The quiz option can be played with either a question countdown style or a time attack style each offering the chance to input your best scores. The style of questions include:- number of networks and hosts- first host address- last host address- broadcast address- network address- find the nth subnet address- calculate the subnet maskand so on...Enjoy!!!Contact us at twitter for more information:


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